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Do Manganese and Iron in Association Cause Biochemical and Genotoxic Changes in Oreochromis Niloticus (Teleostei:
Larissa Souza Passos1,2, Gabriel Carvalho Coppo3,4, Tatiana Miura Pereira3
1Laboratory of Applied Ichthyology, Complex of Biopractices, Vila Velha University, Rua José Dantas de Melo, 21, Boa Vista, Vila Velha, ES, CEP 29102-770, Brazil. larissa-sp-10@hotmail.com.
Abstract:
The present study aimed to evaluate the toxicity of the association between Fe and Mn in Oreochromis niloticus through genotoxic (micronucleus test and comet assay) and biochemical (CAT and GST enzymes) assays. The tested treatments were T1 = control group (without metal addition), T2 = 2.60 mg L-1 of Fe + 0.2 mg L-1 of Mn, and T3 = 4.40 mg L-1 of Fe + 3.49 mg L-1 of Mn, during 96-h bioassays. All animals exposed to the metals showed a significant increase in erythrocyte micronucleus frequency and DNA damage. The hepatic GST activity increased two times in animals exposed to T3 compared to the control group. The results indicate that Fe + Mn caused genotoxic and biochemical changes in exposed fish. Therefore, excess metals in ecosystems, even those essential for organisms, can be dangerous for the local biota due to the risk associated with high concentrations of these metals.
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